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      <a href="/2017/10/07/cyclejs-notes-8-two-way-binding/" title="Cycle.js学习笔记8--双向绑定Input值" itemprop="url">Cycle.js学习笔记8--双向绑定Input值</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2017-10-07T11:30:33.000Z" itemprop="datePublished">2017-10-07</time>
    更新日期:<time datetime="2018-12-18T15:36:21.080Z" itemprop="dateModified">2018-12-18</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Input输入流"><span class="toc-number">1.</span> <span class="toc-text">Input输入流</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Driver驱动"><span class="toc-number">1.1.</span> <span class="toc-text">Driver驱动</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实现流创建和监听"><span class="toc-number">1.2.</span> <span class="toc-text">实现流创建和监听</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#检验实现"><span class="toc-number">1.3.</span> <span class="toc-text">检验实现</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#双向绑定"><span class="toc-number">1.4.</span> <span class="toc-text">双向绑定</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>因为对Rxjs的好感玩上了Cycle.js，《Cycle.js学习笔记》系列用于记录使用该框架的一些笔记。<br>本文我们从了解Driver驱动开始，完成Input值的设置<code>set value</code>，然后实现Input的双向绑定。<br><a id="more"></a></p>
<h2 id="Input输入流"><a href="#Input输入流" class="headerlink" title="Input输入流"></a>Input输入流</h2><hr>
<p>有小伙伴们把Cycle.js翻译中文了，大家可以看看<a href="http://cyclejs.cn/" target="_blank" rel="external">中文文档</a>。</p>
<h3 id="Driver驱动"><a href="#Driver驱动" class="headerlink" title="Driver驱动"></a>Driver驱动</h3><p>这里我们先来看看什么是Driver。<br>Driver其实是一些函数，它用来监听输入流，然后执行必要的副作用操作，最后可能会返回输出流。</p>
<p>至于抽象想象什么的，本骚年已经在<a href="https://godbasin.github.io/2017/09/16/cyclejs-notes-5-design-and-abstraction/">《Cycle.js学习笔记5–关于框架设计和抽象》</a>中发挥过脑洞的力量了。</p>
<p>Driver应该始终与某些<code>I/O effect</code>联系在一起。<br>大多数Driver，比如<code>DOM Driver</code>，以<code>sink</code>（为了描述<code>write</code>）作为输入，以<code>source</code>（为了捕获<code>read</code>）作为输出。</p>
<p>像我们要实现一个Websocket的Driver：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">import</span> &#123;adapt&#125; <span class="keyword">from</span> <span class="string">'@cycle/run/lib/adapt'</span>;</div><div class="line"></div><div class="line"><span class="function"><span class="keyword">function</span> <span class="title">makeSockDriver</span>(<span class="params">peerId</span>) </span>&#123;</div><div class="line">  <span class="keyword">let</span> sock = <span class="keyword">new</span> Sock(peerId);</div><div class="line"></div><div class="line">  <span class="function"><span class="keyword">function</span> <span class="title">sockDriver</span>(<span class="params">outgoing$</span>) </span>&#123;</div><div class="line">    <span class="comment">// 添加流监听</span></div><div class="line">    outgoing$.addListener(&#123;</div><div class="line">      <span class="attr">next</span>: <span class="function"><span class="params">outgoing</span> =&gt;</span> &#123;</div><div class="line">        sock.send(outgoing));</div><div class="line">      &#125;,</div><div class="line">      <span class="attr">error</span>: <span class="function"><span class="params">()</span> =&gt;</span> &#123;&#125;,</div><div class="line">      <span class="attr">complete</span>: <span class="function"><span class="params">()</span> =&gt;</span> &#123;&#125;,</div><div class="line">    &#125;);</div><div class="line"></div><div class="line">    <span class="comment">// 创建流</span></div><div class="line">    <span class="keyword">const</span> incoming$ = xs.create(&#123;</div><div class="line">      <span class="attr">start</span>: <span class="function"><span class="params">listener</span> =&gt;</span> &#123;</div><div class="line">        sock.onReceive(<span class="function"><span class="keyword">function</span> (<span class="params">msg</span>) </span>&#123;</div><div class="line">          listener.next(msg);</div><div class="line">        &#125;);</div><div class="line">      &#125;,</div><div class="line">      <span class="attr">stop</span>: <span class="function"><span class="params">()</span> =&gt;</span> &#123;&#125;,</div><div class="line">    &#125;);</div><div class="line"></div><div class="line">    <span class="keyword">return</span> adapt(incoming$);</div><div class="line">  &#125;</div><div class="line"></div><div class="line">  <span class="keyword">return</span> sockDriver;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="实现流创建和监听"><a href="#实现流创建和监听" class="headerlink" title="实现流创建和监听"></a>实现流创建和监听</h3><p>我们希望能通过<code>set value</code>的方式注入流，我们可以创建一个流，然后调用监听器：</p>
<ol>
<li>创建流，提取出监听器。</li>
<li>将1步骤创建的流作为输入更新Input的value。</li>
<li>在调用<code>setValue()</code>方法时触发监听器。</li>
<li>将Input的<code>change</code>或者<code>keyup</code>事件流，合并3步骤更新的流，作为输出。</li>
</ol>
<p>我们大概能得到这样一个Input：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div></pre></td><td class="code"><pre><div class="line">@bindMethods</div><div class="line"><span class="keyword">export</span> <span class="class"><span class="keyword">class</span> <span class="title">InputComponent</span> </span>&#123;</div><div class="line">  id;</div><div class="line">  listener;</div><div class="line">  DOM;</div><div class="line">  inputGet;</div><div class="line">  inputSet;</div><div class="line">  <span class="keyword">constructor</span>(domSource, type) &#123;</div><div class="line">    <span class="keyword">this</span>.id = id++;</div><div class="line"></div><div class="line">    <span class="comment">// 初始化流，并提取出监听器</span></div><div class="line">    <span class="keyword">this</span>.inputSet = xs.create(&#123;</div><div class="line">      <span class="attr">start</span>: <span class="function"><span class="params">listener</span> =&gt;</span> &#123;</div><div class="line">        <span class="keyword">this</span>.listener = listener;</div><div class="line">      &#125;,</div><div class="line">      <span class="attr">stop</span>: <span class="function"><span class="params">()</span> =&gt;</span> &#123;&#125;,</div><div class="line">    &#125;).startWith(<span class="literal">undefined</span>);</div><div class="line"></div><div class="line">    <span class="comment">// 接上设置流</span></div><div class="line">    <span class="keyword">this</span>.DOM = xs.merge(<span class="keyword">this</span>.inputSet).map(<span class="function"><span class="params">val</span> =&gt;</span></div><div class="line">      &lt;input type=&#123;type&#125; id=&#123;<span class="string">'input'</span> + <span class="keyword">this</span>.id&#125; className=<span class="string">"form-control"</span> value=&#123;val&#125; /&gt;</div><div class="line">    );</div><div class="line"></div><div class="line">    <span class="comment">// 合并输入流和源流，然后输出更新值</span></div><div class="line">    <span class="keyword">this</span>.inputGet = xs.merge(domSource.select(<span class="string">'#input'</span> + <span class="keyword">this</span>.id).events(<span class="string">'keyup'</span>)</div><div class="line">    .map(<span class="function"><span class="params">ev</span> =&gt;</span> ev.target.value), <span class="keyword">this</span>.inputSet).startWith(<span class="string">''</span>);</div><div class="line">  &#125;</div><div class="line">  getDOM() &#123;</div><div class="line">    <span class="keyword">return</span> <span class="keyword">this</span>.DOM;</div><div class="line">  &#125;</div><div class="line">  getValue() &#123;</div><div class="line">    <span class="keyword">return</span> <span class="keyword">this</span>.inputGet;</div><div class="line">  &#125;</div><div class="line">  setValue(val) &#123;</div><div class="line">    <span class="comment">// 触发监听器</span></div><div class="line">    <span class="keyword">this</span>.listener.next(val);</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="检验实现"><a href="#检验实现" class="headerlink" title="检验实现"></a>检验实现</h3><p>检验的时候到了，我们通过设置一个定时器，触发Input输入的自动更新，当然，你也可以自己手动输入验证。</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">LoginComponent</span>(<span class="params">sources</span>) </span>&#123;</div><div class="line">    <span class="keyword">const</span> domSource = sources.DOM;</div><div class="line"></div><div class="line">    <span class="comment">// 登录点击和路由切换</span></div><div class="line">    <span class="keyword">const</span> loginClick$ = domSource.select(<span class="string">'#submit'</span>).events(<span class="string">'click'</span>)</div><div class="line"></div><div class="line">    <span class="comment">// 通过InputComponent注册的Input和值</span></div><div class="line">    <span class="keyword">const</span> unameInputSource = <span class="keyword">new</span> InputComponent(domSource, <span class="string">'text'</span>)</div><div class="line">    <span class="keyword">const</span> unameInputDOM$ = unameInputSource.getDOM()</div><div class="line">    <span class="keyword">const</span> unameInputValue$ = unameInputSource.getValue()</div><div class="line"></div><div class="line">    <span class="comment">// 设计一个定时器，每秒自增1，并输入到username的input</span></div><div class="line">    <span class="keyword">let</span> a = <span class="number">1</span>;</div><div class="line">    setInterval(<span class="function"><span class="params">()</span> =&gt;</span> &#123;</div><div class="line">        unameInputSource.setValue(a++);</div><div class="line">    &#125;, <span class="number">1000</span>);</div><div class="line"></div><div class="line">    <span class="comment">// 合流生成最终DOM流</span></div><div class="line">    <span class="keyword">const</span> loginView$ = xs.combine(unameInputDOM$, unameInputValue$).map(<span class="function">(<span class="params">[unameDOM, unameValue]</span>) =&gt;</span> &#123;</div><div class="line">        <span class="keyword">return</span> (</div><div class="line">            <span class="xml"><span class="tag">&lt;<span class="name">form</span>&gt;</span></span></div><div class="line">                <span class="tag">&lt;<span class="name">h1</span>&gt;</span>System<span class="tag">&lt;/<span class="name">h1</span>&gt;</span></div><div class="line">                <span class="tag">&lt;<span class="name">div</span>&gt;</span></div><div class="line">                    &#123;unameDOM&#125;</div><div class="line">                <span class="tag">&lt;/<span class="name">div</span>&gt;</span></div><div class="line">                &#123;unameValue&#125;</div><div class="line">                <span class="tag">&lt;<span class="name">div</span>&gt;</span></div><div class="line">                    <span class="tag">&lt;<span class="name">a</span> <span class="attr">className</span>=<span class="string">"btn btn-default"</span> <span class="attr">id</span>=<span class="string">"submit"</span>&gt;</span>Login<span class="tag">&lt;/<span class="name">a</span>&gt;</span></div><div class="line">                <span class="tag">&lt;/<span class="name">div</span>&gt;</span></div><div class="line">            <span class="tag">&lt;/<span class="name">form</span>&gt;</span></div><div class="line">        )</div><div class="line">    &#125;</div><div class="line">    );</div><div class="line">    <span class="keyword">return</span> &#123;</div><div class="line">        <span class="attr">DOM</span>: loginView$,</div><div class="line">        <span class="attr">router</span>: loginClick$.mapTo(<span class="string">"/app"</span>)</div><div class="line">    &#125;;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<h3 id="双向绑定"><a href="#双向绑定" class="headerlink" title="双向绑定"></a>双向绑定</h3><p>我们能看到，在定时器的作用下，Input值每秒自增，同时获取到的值也触发更新。<br>当我们讲输入和输出连接到一起的时候，我们就实现了简单的双向绑定。前面也说过了，双向绑定只是个语法糖而已，拆开来说也就是能设置输入，并获取输出。</p>
<p>这时候，我们巧妙地使用<code>get</code>和<code>set</code>，就可以实现双向绑定：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line">@bindMethods</div><div class="line"><span class="keyword">export</span> <span class="class"><span class="keyword">class</span> <span class="title">InputComponent</span> </span>&#123;</div><div class="line">  <span class="comment">// 其他没有改变</span></div><div class="line">  <span class="comment">// 将 getValue 和 setValue 调整为 get 和 set 的方式</span></div><div class="line">  get value() &#123;</div><div class="line">    <span class="keyword">return</span> <span class="keyword">this</span>.inputGet;</div><div class="line">  &#125;</div><div class="line">  set value(val) &#123;</div><div class="line">    <span class="comment">// 触发监听器</span></div><div class="line">    <span class="keyword">this</span>.listener.next(val);</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>这样，我们在使用的时候：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">export</span> <span class="function"><span class="keyword">function</span> <span class="title">LoginComponent</span>(<span class="params">sources</span>) </span>&#123;</div><div class="line">  <span class="comment">// ...其他</span></div><div class="line"></div><div class="line">  <span class="comment">// 通过InputComponent注册的Input和值</span></div><div class="line">  <span class="keyword">const</span> unameInputSource = <span class="keyword">new</span> InputComponent(domSource, <span class="string">'text'</span>)</div><div class="line">  <span class="keyword">const</span> unameInputDOM$ = unameInputSource.getDOM()</div><div class="line">  <span class="comment">// 通过获取值的方式</span></div><div class="line">  <span class="keyword">const</span> unameInputValue$ = unameInputSource.value</div><div class="line"></div><div class="line">  <span class="comment">// 设计一个定时器，每秒自增1，并输入到username的input</span></div><div class="line">  <span class="keyword">let</span> a = <span class="number">1</span>;</div><div class="line">  setInterval(<span class="function"><span class="params">()</span> =&gt;</span> &#123;</div><div class="line">    <span class="comment">// 通过设置的方式</span></div><div class="line">    unameInputSource.value = a++;</div><div class="line">  &#125;, <span class="number">1000</span>);</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>塔嗒！是不是好了。</p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>这节主要简单（真的很简单）介绍了驱动Driver，并成功地完成了之前没有完成的部分，完成Input的输入，并将Input的输入和输出衔接在一起，对外呈现出一种双向绑定的方式。<br><a href="https://github.com/godbasin/godbasin.github.io/tree/blog-codes/cyclejs-notes/8-two-way-binding" target="_blank" rel="external">此处查看项目代码</a><br><a href="http://cyclejs-notes.godbasin.com/8-two-way-binding/index.html" target="_blank" rel="external">此处查看页面效果</a></p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
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	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
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